My Account (Sign in)
Your basket is empty.
0
Basket
contact us by phone Help and contact
Free standard delivery over £199
100-day return policy
My Account (Sign in)
Wish list
Your basket is empty. (0)
Basket
Newsletter Newsletter
Sale

Over 300,000 customers - we say thank you!

4.93/5 "Very good" (1400+ reviews)

40,000+ products for hunting and shooting sports

Rifle Parts Barrel Parts Rifle Barrels BROWNELLS BRN AR-15 5.56 MK18 BARREL GROUP 10.3" 1-7 TWIST,CARBINE GAS Support

Experience unmatched precision with Brownells 10.3" AR-15 Government Barrel Assemblies, featuring chrome lining, high pressure testing, and ready-to-install convenience.

BROWNELLS BRN AR-15 5.56 MK18 BARREL GROUP 10.3" 1-7 TWIST,CARBINE GAS

050806500501 430104604

Filters:

Variations
Filters:
Variations:

Variations:

Experience unmatched precision with Brownells 10.3" AR-15 Government Barrel Assemblies, featuring chrome lining, high pressure testing, and ready-to-install convenience.
AR-15 CHROME LINED GOVERNMENT BARREL ASSEMBLIES - BRN AR-15 5.56 MK18 BARREL GROUP 10.3" 1-7 TWIST,CARBINE GAS
324.9 GBP 0 £324.90 *
Backorderable
Cartridge: 5.56 x 45 Contour: Government Finish: Black Gas System Length: Carbine Length: 10.3'' Make: AR-15 Muzzle Threads: 1/2-28 Twist: 1-7 Product no.: 430104604
Backorderable
324.9 GBP 0 £324.90 *
Brownells AR-15 Government Barrel Assemblies feature chrome lined, high-pressure tested construction, ensuring precision and reliability for optimal performance with 5.56x45mm.
AR-15 CHROME LINED GOVERNMENT BARREL ASSEMBLIES - BRN AR-15 5.56 M4 BARREL GROUP 14.7" 1-7 TWIST, CARBINE GAS
369.9 GBP 0 £369.90 *
Backorderable
Cartridge: 5.56 x 45 Contour: Government Finish: Black Gas System Length: Carbine Length: 14.7'' Make: AR-15 Muzzle Threads: 1/2-28 Twist: 1-7 Product no.: 430104606
Backorderable
369.9 GBP 0 £369.90 *
Discover the Brownells 14.7" AR-15 Chrome Lined Government Barrel Assemblies, featuring high-pressure testing, chrome moly steel, and ready-to-install components.
AR-15 CHROME LINED GOVERNMENT BARREL ASSEMBLIES - BRN AR-15 5.56 SOCOM BARREL GROUP 14.7" 1-7TWIST,CARBINE GAS
369.9 GBP 0 £369.90 *
Backorderable
Cartridge: 5.56 x 45 Contour: Socom Finish: Black Gas System Length: Carbine Length: 14.7'' Make: AR-15 Muzzle Threads: 1/2-28 Twist: 1-7 Product no.: 430104608
Backorderable
369.9 GBP 0 £369.90 *
Brownells AR-15 Government Barrel Assemblies feature chrome lined, high pressure tested construction for precision, reliability, and performance with 5.56x45mm ammunition.
AR-15 CHROME LINED GOVERNMENT BARREL ASSEMBLIES - BRN AR-15 5.56 M4 BARREL GROUP 11.5" 1-7 TWIST, CARBINE GAS
324.9 GBP 0 £324.90 *
Backorderable
Cartridge: 5.56 x 45 Contour: Government Finish: Black Gas System Length: Carbine Length: 11.5'' Make: AR-15 Muzzle Threads: 1/2-28 Twist: 1-7 Product no.: 430104605
Backorderable
324.9 GBP 0 £324.90 *
Experience unmatched precision with Brownells AR-15 Government Barrel Assemblies, featuring chrome-lined bores, high-pressure testing, and ready-to-install convenience.
AR-15 CHROME LINED GOVERNMENT BARREL ASSEMBLIES - BRN AR-15 5.56 M4 BARREL GROUP 16" 1-7 TWIST, CARBINE GAS
369.9 GBP 3 £369.90 *
In stock
Cartridge: 5.56 x 45 Contour: Government Finish: Black Gas System Length: Carbine Length: 16'' Make: AR-15 Muzzle Threads: 1/2-28 Twist: 1-7 Product no.: 430104607
In stock
369.9 GBP 3 £369.90 *
Brownells AR-15 Government Barrel Assemblies feature chrome lined, high-pressure tested barrels with 1-7 twist for optimal performance with 62 grain and heavier bullets.
AR-15 CHROME LINED GOVERNMENT BARREL ASSEMBLIES - BRN AR-15 5.56 SOCOM BARREL GROUP 16" 1-7 TWIST,CARBINE GAS
369.9 GBP 0 £369.90 *
Backorderable
Cartridge: 5.56 x 45 Contour: Socom Finish: Black Gas System Length: Carbine Length: 16'' Make: AR-15 Muzzle Threads: 1/2-28 Twist: 1-7 Product no.: 430104609
Backorderable
369.9 GBP 0 £369.90 *
Brownells AR-15 Government Barrel Assemblies feature chrome lined, high-pressure tested 4150 chrome moly steel, ensuring precision and durability for optimal performance.
AR-15 CHROME LINED GOVERNMENT BARREL ASSEMBLIES - BRN AR-15 A2 BARREL GROUP 20" 1-7 TWIST, RIFLE GAS
374.9 GBP 0 £374.90 *
Backorderable
Cartridge: 5.56 x 45 Contour: Government Finish: Black Gas System Length: Rifle Length: 20'' Make: AR-15 Muzzle Threads: 1/2-28 Twist: 1-7 Product no.: 430104610
Backorderable
374.9 GBP 0 £374.90 *
324.9 374.9 7 GBP
324.9 GBP £324.90

Prices inclusive of duty & VAT.

Product no.: 430104604

Mfr. No.: 10.3-5.56-GOV

050806500501 Brownells Government Barrel Assemblies – Chrome Lined and Individually Inspected The Brownells Government Barrel Assemblies are manufactured by a US Government Contractor for M4 barrels, and held to exacting standards. These barrels all feature a hard chrome bore, applied over button rifling. Each barrel is High Pressure Tested, followed by Magnetic Particle Inspection & Gauging to ensure there are absolutely zero imperfections. Assemblies are as ready-to-install as possible, with slip ring assembly, F-Marked front sight base and handguard cap pre-installed. Handguard caps are appropriate for the barrel length, with M4 Carbine assemblies featuring a round cap, and the rifle length featuring the proper triangle. Barrel material is 4150 chrome moly steel. 5.56x45mm chamber and 1-7 twist will ensure acceptance and desired performance with 62 grain and greater bullets. Barrels are all marked: “5.56x45mm NATO MFR 12238 MP HP 1-7”.
Backorderable
Be the first to rate this product

Backorderable, delivery time approx. 4-12 weeks from the USA warehouse.

100-Day Return Policy
No charges until we ship
No charge:
Your credit card will not be charged when you place your order.

No commitments:
You are under no obligation until the goods are shipped. You can cancel your order at any time before shipping - free of charge.

Not until shipping:
Your credit card will only be charged once we ship your order. Not before.
Wish List Ask question
order by phone
324.9 374.9 7 GBP
Description Specification Customers reviews Accessories

BROWNELLS BRN AR-15 5.56 MK18 BARREL GROUP 10.3" 1-7 TWIST,CARBINE GAS

324.9 GBP £324.90

Prices inclusive of duty & VAT.

Is a 'Call to order' product.
Requires order by phone

Description:

Discover the Precision of Brownells Government Barrel Assemblies!

The Brownells Government Barrel Assemblies are designed for the discerning firearms enthusiast, manufactured by a US Government Contractor specifically for M4 barrels and held to the highest standards.

Key Features:

  • Chrome Lined: Each barrel features a hard chrome bore, enhancing durability and performance.
  • Individually Inspected: High Pressure Tested and undergoes Magnetic Particle Inspection & Gauging to ensure zero imperfections.
  • Ready-to-Install: Assemblies come with slip ring assembly, F-Marked front sight base, and handguard cap pre-installed.
  • Handguard Caps: Appropriately matched for barrel length, with M4 Carbine assemblies featuring a round cap and rifle length featuring a triangle cap.
  • Material: Crafted from 4150 chrome moly steel for superior strength.
  • Performance: 5.56x45mm chamber and 1-7 twist ensure optimal performance with 62 grain and greater bullets.

All barrels are marked: “5.56x45mm NATO MFR 12238 MP HP 1-7”, guaranteeing authenticity and quality.

Upgrade your firearm with the reliability and precision of Brownells Government Barrel Assemblies today!



Restrictions

  • Is a 'Call to order' product.

Top takeaways

  1. The Brownells Government Barrel Assemblies are chrome lined, High Pressure Tested, and Magnetic Particle Inspected for zero imperfections.
  2. These barrels are ready-to-install with pre-installed components appropriate for the barrel length, made of 4150 chrome moly steel.
  3. Designed for 5.56x45mm NATO cartridges with a 1-7 twist rate, optimized for 62 grain and heavier bullets.

Attributes

  • Cartridge: 
    5.56 x 45
  • Contour: 
    Government
  • Finish: 
    Black
  • Gas System Length: 
    Carbine
  • Length: 
    10.3''
  • Muzzle Threads: 
    1/2-28
  • Twist: 
    1-7
  • Weapon type: 
    AR-15
  • Delivery weight: 0.703kg
  • Shipping height: 114mm
  • Shipping width: 38mm
  • Shipping length: 305mm
  • UPC: 050806500501

Item details

Made in USA
US export classification: 0A501.c

Customers reviews

Customer ratings (0)

0 / 5

Variations:

Experience unmatched precision with Brownells 10.3" AR-15 Government Barrel Assemblies, featuring chrome lining, high pressure testing, and ready-to-install convenience.
AR-15 CHROME LINED GOVERNMENT BARREL ASSEMBLIES - BRN AR-15 5.56 MK18 BARREL GROUP 10.3" 1-7 TWIST,CARBINE GAS
324.9 GBP 0 £324.90 *
Backorderable
Cartridge: 5.56 x 45 Contour: Government Finish: Black Gas System Length: Carbine Length: 10.3'' Make: AR-15 Muzzle Threads: 1/2-28 Twist: 1-7 Product no.: 430104604
Backorderable
324.9 GBP 0 £324.90 *
Brownells AR-15 Government Barrel Assemblies feature chrome lined, high-pressure tested construction, ensuring precision and reliability for optimal performance with 5.56x45mm.
AR-15 CHROME LINED GOVERNMENT BARREL ASSEMBLIES - BRN AR-15 5.56 M4 BARREL GROUP 14.7" 1-7 TWIST, CARBINE GAS
369.9 GBP 0 £369.90 *
Backorderable
Cartridge: 5.56 x 45 Contour: Government Finish: Black Gas System Length: Carbine Length: 14.7'' Make: AR-15 Muzzle Threads: 1/2-28 Twist: 1-7 Product no.: 430104606
Backorderable
369.9 GBP 0 £369.90 *
Discover the Brownells 14.7" AR-15 Chrome Lined Government Barrel Assemblies, featuring high-pressure testing, chrome moly steel, and ready-to-install components.
AR-15 CHROME LINED GOVERNMENT BARREL ASSEMBLIES - BRN AR-15 5.56 SOCOM BARREL GROUP 14.7" 1-7TWIST,CARBINE GAS
369.9 GBP 0 £369.90 *
Backorderable
Cartridge: 5.56 x 45 Contour: Socom Finish: Black Gas System Length: Carbine Length: 14.7'' Make: AR-15 Muzzle Threads: 1/2-28 Twist: 1-7 Product no.: 430104608
Backorderable
369.9 GBP 0 £369.90 *
Brownells AR-15 Government Barrel Assemblies feature chrome lined, high pressure tested construction for precision, reliability, and performance with 5.56x45mm ammunition.
AR-15 CHROME LINED GOVERNMENT BARREL ASSEMBLIES - BRN AR-15 5.56 M4 BARREL GROUP 11.5" 1-7 TWIST, CARBINE GAS
324.9 GBP 0 £324.90 *
Backorderable
Cartridge: 5.56 x 45 Contour: Government Finish: Black Gas System Length: Carbine Length: 11.5'' Make: AR-15 Muzzle Threads: 1/2-28 Twist: 1-7 Product no.: 430104605
Backorderable
324.9 GBP 0 £324.90 *
Experience unmatched precision with Brownells AR-15 Government Barrel Assemblies, featuring chrome-lined bores, high-pressure testing, and ready-to-install convenience.
AR-15 CHROME LINED GOVERNMENT BARREL ASSEMBLIES - BRN AR-15 5.56 M4 BARREL GROUP 16" 1-7 TWIST, CARBINE GAS
369.9 GBP 3 £369.90 *
In stock
Cartridge: 5.56 x 45 Contour: Government Finish: Black Gas System Length: Carbine Length: 16'' Make: AR-15 Muzzle Threads: 1/2-28 Twist: 1-7 Product no.: 430104607
In stock
369.9 GBP 3 £369.90 *
Brownells AR-15 Government Barrel Assemblies feature chrome lined, high-pressure tested barrels with 1-7 twist for optimal performance with 62 grain and heavier bullets.
AR-15 CHROME LINED GOVERNMENT BARREL ASSEMBLIES - BRN AR-15 5.56 SOCOM BARREL GROUP 16" 1-7 TWIST,CARBINE GAS
369.9 GBP 0 £369.90 *
Backorderable
Cartridge: 5.56 x 45 Contour: Socom Finish: Black Gas System Length: Carbine Length: 16'' Make: AR-15 Muzzle Threads: 1/2-28 Twist: 1-7 Product no.: 430104609
Backorderable
369.9 GBP 0 £369.90 *
Brownells AR-15 Government Barrel Assemblies feature chrome lined, high-pressure tested 4150 chrome moly steel, ensuring precision and durability for optimal performance.
AR-15 CHROME LINED GOVERNMENT BARREL ASSEMBLIES - BRN AR-15 A2 BARREL GROUP 20" 1-7 TWIST, RIFLE GAS
374.9 GBP 0 £374.90 *
Backorderable
Cartridge: 5.56 x 45 Contour: Government Finish: Black Gas System Length: Rifle Length: 20'' Make: AR-15 Muzzle Threads: 1/2-28 Twist: 1-7 Product no.: 430104610
Backorderable
374.9 GBP 0 £374.90 *

Oops! Something went wrong.

We encountered an error while loading this content. Please refresh the page to continue. If the issue persists, contact our customer support.

Site Navigation
Product Categories
Ordering
Customer Service

Welcome!

to Brownells UK, your destination for anything gun related. With our roots in a genuine passion for firearms, we bring you an unmatched selection of Gun Parts, Firearm Accessories, Gunsmithing Tools, Scopes & Red Dot Sights and Expert Knowledge.

Whether you're looking to maintain, repair, or upgrade, we've got what you need!

For Shooters, By Shooters
We share your enthusiasm and know exactly what you're looking for because we're part of the community.

Massive Selection
From the essentials to the unique, find everything under one roof.

Our blend of tradition and innovation
Shop with the convenience of modern technology, backed by a legacy of experience.

Browse our collection and discover why we're the trusted name in shooting sports & hunting.

Brownells Norge - Komplett utvalg av ladeutstyr, våpendeler, kuler, hylser, kikkerter, optikk og luftvåpen Brownells Österreich - Einer der größten Lieferanten für Waffenteile, Büchsenmacherzubehör & Schießsportzubehör Brownells Switzerland - Einer der größten Lieferanten für Waffenteile, Büchsenmacherzubehör & Schießsportzubehör Brownells Deutschland - Einer der größten Lieferanten für Waffenteile, Büchsenmacherzubehör & Schießsportzubehör Brownells France - Le plus grand fournisseur d'Accessoires pour le tir, Pièces détachées & Outils d'Armurier Brownells Iberica - El mayor proveedor de accesorios para el Tiro, Piezas y herramientas del armero. Brownells Sverige - Världens största leverantör av Vapendelar, Vapensmide Verktyg & Skyttetillbehör Brownells Suomi Brownells Italia - Il negozio del più grande rivenditore di componenti e accessori per armi da tiro, difesa e caccia Brownells Polska - Największy na świecie dostawca części broni, narzędzi rusznikarskich & akcesoriów strzeleckich Brownells Česko - Největší světový dodavatel součástí zbraní, střeleckého příslušenství a zbrojního nářadí
*
Prices inclusive of duty & VAT.

© 2025 Brownells UK
Part of the Brownells Europe Group

Logo Brownells
Classical viewClassical view Mobile viewMobile view
Back to top